前向迭代多随机相位光学图像加密方法的研究

Optical image encryption by the use of forward iteractive phase retrieval algorithm and multiple random-phase masks

基于光学4f级联系统,采用前向迭代算法和通过产生多个随机相位板对图像进行了加密和解密。给出了该方法的原理和迭代实现的过程。对该方法在收敛速度、解密图像质量、相位板数目和相位量化阶数对解密图像质量的影响以及保密和安全性能等方面进行了分析和研究。模拟结果表明,该方法收敛速度快,解密图像质量好,可以降低相位板相位量化阶数有限所引起的误差对解密图像质量的影响,图像的安全和保密性能也得到了很大的提高。

The method of the multiple-random-phase by the use of forward iterative phase retrieval algorithm for optical image encryption is described and demonstrated with computer simulation experiments. The convergent speed of the method is significantly increased and the decrypted image is similar to the target image. The errors caused by the quantization of phase masks are decreased with the proposed method. The relationships between the numbers of phase masks and quantized phase levels are also discussed by the results of computer simulation. In addition, with more phase keys, the security and secrecy of image are greatly increased. The proposed method is verified by computer simulation.